Question

我正在开发一个应用程序，其中我需要根据用户选择的间隔显示通知。即使应用已关闭，我也必须显示这些通知。我已经使用AlarmManager来安排重复通知。当应用程序正在运行或尝试时，它运行正常，但如果应用程序被杀死，则无法正常工作。

public static void setRecurringNotification(Context context, long scTime) {
    System.out.println("Inside setRecurringNotification()");

    Intent notificationIntent = new Intent(context,
            NotificationReceiver.class);

    pendingIntentNotification = PendingIntent.getBroadcast(context, 0,
            notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);

    AlarmManager alarmManager = (AlarmManager) context
            .getSystemService(Context.ALARM_SERVICE);

    alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP,
            SystemClock.elapsedRealtime() + scTime, scTime,
            pendingIntentNotification);
}// End of setRecurringAlarm()

以下是NotificationReceiver类：

public class NotificationReceiver extends WakefulBroadcastReceiver {

    public static void sendNotification(Context context, MyMessage msg) {
        System.out.println("sendNotification(): " + msg.getId());

        Uri soundUri = RingtoneManager
                .getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationManager mNotificationManager = (NotificationManager) context
                .getSystemService(Context.NOTIFICATION_SERVICE);

        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, MainActivity.class), 0);

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
                context)
                .setSmallIcon(R.drawable.ic_launcher)
                .setContentTitle(msg.getTitle())
                .setSmallIcon(R.drawable.ic_launcher)
                .setStyle(
                        new NotificationCompat.BigTextStyle().bigText(msg.getContent()))
                .setContentText(msg.getContent())
                .setSound(soundUri);

        mBuilder.setContentIntent(contentIntent);
        mNotificationManager.notify(1, mBuilder.build());
    }// End of sendNotification

    @Override
    public void onReceive(Context context, Intent intent) {
        System.out.println("Inside NotificationReceiver.onReceive...");
        try {

            new NotifyUser(context).execute();
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
        setResultCode(Activity.RESULT_OK);

    }

    private class NotifyUser extends AsyncTask<Void, Void, String> {
        private Context context;

        public NotifyUser(Context context) {
            this.context = context;
        }

        @Override
        protected String doInBackground(Void... params) {
            SQLHelper sqlHelper = new SQLHelper(context);
            try {
                MyMessage msg = sqlHelper.getRandomMyMessageFromDB();
                if (null != msg)
                    sendNotification(context, msg);
            }
            catch (Exception ex) {
                ex.printStackTrace();
            }
            return null;
        }
    }
}

Answer 1

关闭应用时，您必须使用Android服务执行后台操作。有关更多详细信息，请参阅Android Official Documentation

即使应用程序未运行，如何显示通知

1 个答案: